Posterior-stabilized design

A posterior-stabilized (PS) knee replacement design is a type of artificial knee that provides extra stability by replacing or modifying certain knee ligaments. In a natural knee, specific ligaments help keep the joint stable during movement. In a PS implant, a special feature called a cam and post mechanism mimics this role, preventing the tibia (shinbone) from moving too far forward relative to the thighbone. This design improves stability during activities like walking and bending, offering better alignment and controlled motion. It's commonly used when the natural ligaments are damaged or missing, helping patients regain function with a secure, smooth-acting joint.